Improvement in scroll-sawing machines



j 2 Sheets-Sheet 2. 'P. RADEMANN. Scroll-Sawing Machine.

Patented May/13,1879

UNITED STATES PATENT OEEIoE.

PETER RADEMANN, CF JERSEY CITY, NEW JERSEY.

IMPROVEMENT IN SCROLL-SAWING MACHINES.

`Specification forming partof Letters Patent No. March To all 'whom itmay concern:

Beit known that I, PETER RADEMANN, of Jersey City, Hudson county, Stateof New J ersey, have invented certain new and useful Improvements inScroll Sawing Machines, of which the following is a specification.

The present invention relates to the mechanism for imparting amultiplied reciprocat-ory motion to the saw from the fly-wheel, to theconstruction of the sustaining-frame of the machine, and also to thedevices for adjusting the inclination of the saw, all of which embodynovel features, as hereinafter fully set forth.

Figure 1 of the drawings presents a side elevation of my improvedmachine, and Fig. 2 a front elevation thereof. l Fig. 3 is a reverseside elevation of the drivin g-wheel and the saw driving mechanismremoved from the frame. Figs. 4i and 5 present a side elevation andplan, respectively, of the sectional treadle.

The main portion of the frame consists, as shown in Figs. 1 and 2, of acentral web, A, formed of a continuous iiat casting, light and strong,and of a neat open scrolled design, and having the overhanging arm o,whichsupports the saw-adjusting devices, formed continuous therewith, asshown. The body of the frameweb terminates in the pendent standards orlegs a a, which are fitted to the inverted-T- shaped feet or bases B B,which, having a good spread, give a firm support to the frame. Thecentral upright of these feet is formed with a groove, into which theedges of the legs a c are socketed, and slots bin these uprights permitthe fastening-` studs c, by which the feet are held to the frame, to bemoved up or down, thus, as will be readily understood, rendering, theframe vertically adjustable on the feet B B, by which the height of themachine may be adjusted to suit different persons, or to suit a sittingor a standing position.

"The table eis secured to the top of the frame, beneath the overhangingarm, by the crossbars d d,the rear one of which is scarfed into the edgeof the frame, while the front one is grooved to socket over the fronten'd of the frame-web, as shown. It will thus be readily seen that whilethis form of frame is light, simple, 'and neat, it has also theadvantages of adj ustability and cheapness.

The fly-wheel C is driven directly from the 215,241, dated May 13, 1879;application filed 6, 1879.

treadle, as shown, and the saw is driven directly from the wheel by animproved form of escapement-cams, which impart a number of strokes tothe saw with one revolution of the wheel, and which forms one feature ofthe invention. The coupled saw-levers ff and the saw-guide bar g aredriven by the reciprocating drivin g-bar D, which Works in the guides hIt on the frame, the ends of the saw being attached, as shown, directlyto the hooked end of the guide-rod g.

Thelowerpa'rt of the driving-bar D is swelled into an open square, andis fitted with two projections or rollers, i z', arranged atdiagonallyopposite corners, as shown in Fig. 3, and these rollers arealternatelystruck by a series of ra dial cam-ribs, F, on the hub of thefly-wheel, which, as the wheel revolves, impart a number ofreciprocations to the drivin g-bar, thus causing the bar to make threedouble strokes with one revolution of the wheel. A more multipliedmotion may be obtained by fitting the hub of the wheel with a greaternumber of cam-ribs; but the three shown are preferred.

It will be noted that the rollers t t' are so arranged relatively to thecam-ribs that the ribs iirst strike the rollers near their inner endsand retire from the rollers at their outer ends, which are rounded oil',as shown.

greatest leverage is obtained at the commencement of the np-and-downstrokes, where the greatest power is required to start the saw throughthe work, which is an important ad* vantage over other movements of`this class, which generallyr have the leverage reversed, being least atthe beginning and greatest at the termination, which is not well adaptedfor the purpose of asaw.

It will also be seen, on reference to Fig. 3, that the acting face ofeach of the cam-ribs is fitted with a small cushion of leather, 7c, atthe pointA where the ribs first strike the rollers, which renders thecontact elastic and noiseless. Cushions Z, Fig. l, are also fitted onthe frame above and 'below the driving-bar, to form elastic stops forlimitingits movements, these cushions being preferably formed of rubbersocketed in lugs on the frame.

The saw-levers ff are pivoted, as shown in stem of the driving-bar D andto the hooked By this arrangementit will be seen thatftlie Fig. l, inthe middle, and the tension of the saw is regulated by means of themovable fulcrum-block Gr, on which the upper lever is pivoted, and whichis hung from a supportinglug, m, projecting from the arm o. Thisfulcrum-blockis formed, as shown, with a threaded stem, which passesthrough the lug m, and is iitted with the thumb-screw w, which bearsupon the lug, and by turning which the lever may be raised or lowered,thus adjusting the tension of the saw-blade. This, as will be observed,forms a very simple and effective tension device, and being at themiddle of the lever it is within convenient reach of the operator, whocan thus manipulate it without rising from in front of the table.

The guide-rod g moves in the guide-blocks n o, each of which is formedwith a threaded shank, which passes through openings in the arm, and'are fitted with thumb-screws, as shown, by which the blocks may be heldin proper position. The lower bloeien, is swiveled on its stem in theend of the arm, while the upper block, o, is capable of lateral adjustment by means of a slot in the arm through which its stem passes, asshown by dotted lines in Fig. 1, and by this adjustment the saw may beset to work straight, or at more or less of a forward inclination, whenit is desired to give the out of the saw a slight forward thrust, aswill be readily understood.

The remaining feature of my invention lies in the construction of thetreadle, which is made in interchangeable sections, which it it for astanding or sitting position. The pivoted section ofthe treadle H, asshown in Figs.

l, 2, 4, and 5, is a double pedal-plate, of similar form to ordinarysitting-treadles, adapted to receive both feet of the operator whensitting, and it is formed with the short pintles Fig. 5, which socket ineyes i" fr on the feet B of the frame. One of these eyes is continuous,while the other is forked or slotted, as shown in Fig. 5, so that itwill be seen that when the pitman is detached from the slotted lug s ofthe treadle the treadle may be readily r`rremoved fromthe eyes by partlytilting it and moving it sidewise from the eyes. It will be seen thatthe feet ofthe frame at the back of the machine are fitted with similareyes, so that by removing the pedal-plate H from the front, andinverting it, it may then be pivoted on the hind feet, as shown in Figs.4 and 5.

Now, I is a long treadlelever, which is adapted to couple with theinverted pedalplate H, so as to extend to the front of the machine toform a standing treadle for the use of one foot when the operatorstands. This long lever I is rigidly coupled with the pivotedpedal-plate H by means of a tenon, t, on its end, which enters a loop,t', on the pivoted plate, and a projection, u, which enters the slot ofthe pitman-lug s, and is there held by a screw, as shown in Figs. 4 and5. The pitman of the iiy-wheel is then connected with the lever, asshown, being inserted in a slot near its middle, and there held by astud.

This construction ofthe treadle is thus simple and cheap, andpractically combines two treadles in one, suitable for either heavy orlight work, and for sitting or standing positions, according as themachine is raised or lowered.

The combined features of construction described form a very eiectivemachine for scrol1- sawing, containing few parts, being light and simplein its action, and provided with ample adjustments.

What I claim as my invention is l. The combination, in a scroll-sawingmachine, of a rotary driving-wheel, having its hub provided with aseries of radial cam-ribs,

with a sliding frame or bar communicating y motion to the saw, and ttedwith points or rollers at opposite sides, arranged so as to be struck bythe inner ends of the revolving camy ribs, whereby a multiplied reciprocatory movement is imparted to the saw-frame with greater leverage atthe commencement of the stroke, substantially as herein shown anddescribed.

2. lThe combination of the sliding saw-frame D with the cam-ribs F ofthe driving-wheel, fitted with cushions at the' point where drivingcontact is iirst made with the saw-frame, substantially as set forth.

3. The combination of the driving-wheel provided with the cam-ribs F andthe reciprocating frame D with the elastic stop Z, substantially asshown and described.

4. The combination, in a scroll-saw, of the sliding guide-bar gwith theswiveled guideblock n, and the laterally-adjustable guideblock o,substantially as and for the purpose set forth.

5. A scroll-saw frame formed of a central frame-web, A, in combinationwith the inverted-T-shaped feet B B, fitted with a groove to receive theedges of the frame-web, and with slots and fastening-screws to permitthe vertical adjustment of the frame, substantially as herein shown anddescribed.

PETER RADEMANN.

Witnesses:

EDWARD H. WALES, GHAs. M. HIGGINS.

